GF30.20-P-2020V Component Description For the Throttle Valve Actuator

Component Description For The Throttle Valve Actuator

Component Identification:

Location
The throttle valve actuator is flanged to the intake manifold at the rear.

Task
The throttle valve actuator regulates the functions:
- Idle speed
- Drive mode, according to accelerator pedal position, load and requests of momentary interface
- Engine 272.985: In stratified charge operation with excess air open the throttle valve as wide as possible depending on the performance map.
- Cruise control mode
- Emergency electronic accelerator pedal

Component Identification:

Function
The actuator motor (M16/6m1) in the throttle valve actuator (M16/6) adjusts the opening angle of the throttle valve (1) continuously from approx. 0 to 90 degree according to presets from the ME control unit.

The typical power consumption of the pulse width modulation signal is approx. 1 A, however it is possible up to approx. 9 A. For output stage protection the power is limited to 6 A after approx. 30 seconds.
The actual value potentiometers (M16/6r3, M16/6r4) report the current position of the throttle valve to the ME control unit. The signals of both actual value potentiometer are opposed.

A. Ignition "Off"
In a deenergized state, throttle valve position is determined by the spring capsule (3) (8 up to 10 degree opening angle).
B. Ignition "On"
When the ignition is switched on, the actuator motor in the throttle valve actuator is operated by the ME control unit.
The throttle valve adopts a position which depends on the coolant temperature.
c. Idle speed
Depending on the coolant temperature and engine load, the actuator motor changes the rpm in the idle speed range by opening the throttle valve further (increased mixture) or closing it further. (less mixture). Here the throttle valve can be closed further by the actuator motor against force of the spring capsule.
D. Driving mode
In the driving mode (full / partial load), the actuator motor changes the throttle valve position depending on the different load states and / or according to the input signals from the accelerator pedal sensor dependent on the performance maps.
E. Emergency running
If the actuator is deenergized, the throttle valve is set by the spring capsule to approx. 8 to 10 degree opening angle. In the idle speed range, this results in an engine speed of approx. 1200 to 1400 rpm.

For first time connection of the throttle valve actuator to circuit 30 or 87, the ME control unit carries out the following actions automatically within approx. 60 seconds:
- Determination of the emergency running position
- Determination of the lower mechanical stop
- Adaptation of the actual value amplifier (signal 1 and 2) in the ME control unit.
- Checking the return spring (always takes place when ignition ON) Prerequisite: gear P or N, vehicle stationary, engine OFF, ignition ON, coolant temperature 5 degree C to 100 degree C and accelerator pedal not operated. The procedure must be activated with STAR DIAGNOSIS, if the throttle valve actuator or the ME control unit was replaced, otherwise engine surges can occur.